CATALYTIC DESTRUCTION OF AROMATIC VOCs ON SCR-DeNOx COMMERCIAL CATALYST

2007 ◽  
Vol 6 (1) ◽  
pp. 13-20 ◽  
Author(s):  
Liliana Lazar ◽  
Heinz Koser ◽  
Ion Balasanian ◽  
Florin Bandrabur
Keyword(s):  
Commercial Catalyst ◽  
Catalytic Destruction

Regeneration of a Commercial Catalyst for the Dehydrogenation of Isobutane to Isobutene

2013 ◽  
Vol 36 (9) ◽  
pp. 1593-1598 ◽  
Author(s):  
S. K. Masoudian ◽  
S. Sadighi ◽  
A. Abbasi ◽  
F. Salehirad ◽  
A. Fazlollahi
Keyword(s):  
Commercial Catalyst

Preparation of rigid polyurethane foams using low-emission catalysts derived from metal acetates and ethanolamine

e-Polymers ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 265-275 ◽  
Author(s):  
Duangruthai Sridaeng ◽  
Wannisa Jitaree ◽  
Preecha Thiampanya ◽  
Nuanphun Chantarasiri
Keyword(s):  
Compressive Strength ◽  
Catalytic Activity ◽  
Rise Time ◽  
Polyurethane Foams ◽  
Gel Time ◽  
Commercial Catalyst ◽  
Metal Acetate ◽  
Viscous Liquids ◽  
Low Emission ◽  
Cu And Zn

AbstractTwo metal acetate-ethanolamine complexes, namely Cu(OAc)2(EA) and Zn(OAc)2(EA), were synthesized from metal acetates [M(OAc)2, where M=Cu and Zn] and ethanolamine (EA). These metal acetate-ethanolamine complexes can be used as catalysts in the preparation of rigid polyurethane (RPUR) foams. Both Cu(OAc)2(EA) and Zn(OAc)2(EA) were obtained as viscous liquids, which have very weak odor and could be easily dissolved in the starting materials of RPUR foam formulation. The results were compared with RPUR foam prepared from dimethylcyclohexylamine (DMCHA), which is a commercial catalyst with very strong amine odor. Considering the gel time and rise time, Cu(OAc)2(EA) had higher catalytic activity than Zn(OAc)2(EA) and both metal acetate-ethanolamine complexes had lower catalytic activity than DMCHA. Density and compressive strength of RPUR foam catalyzed by Cu(OAc)2(EA) were comparable to that prepared from DMCHA.

Catalytic destruction of 2,4-D in aqueous environment using transition metal-doped ZnO nanoparticles under ultrasonic waves, UV and visible light

2021 ◽  
Vol 226 ◽  
pp. 137-146
Author(s):  
Roya Ebrahimi ◽  
Afshin Maleki ◽  
Kazem Godini ◽  
Reza Rezaee ◽  
Ali Jafari ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Zno Nanoparticles ◽  
Ultrasonic Waves ◽  
Aqueous Environment ◽  
Catalytic Destruction ◽  
Doped Zno ◽  
Metal Doped

Catalytic destruction of paraoxon by metallomicelle layers of Co(II) and Cr(III)

2005 ◽  
Vol 8 (2) ◽  
pp. 203-206 ◽  
Author(s):  
A. A. Hafiz ◽  
M. Y. El Awadi ◽  
A. M. Badawi ◽  
S. M. Mokhar
Keyword(s):  
Catalytic Destruction

scholarly journals Selectivity and Activity of Iron Molybdate Catalysts in Oxidation of Methanol

2009 ◽  
Vol 6 (1) ◽  
pp. 1 ◽  
Author(s):  
Khalid Khazzal Hummadi ◽  
Karim H. Hassan ◽  
Phillip C.H. Mitchell
Keyword(s):  
Iron Oxide ◽  
Methanol Oxidation ◽  
Mole Fraction ◽  
Oxygen Mixture ◽  
Iron Molybdate ◽  
Commercial Catalyst ◽  
Total Oxidation ◽  
Basic Oxide ◽  
Oxidation Of Methanol ◽  
Patent Literature

The selectivity and activity of iron molybdate catalysts prepared by different methods are compared with those of a commercial catalyst in the oxidation of methanol to formaldehyde in a continuous tubular bed reactor at 200-350 oC (473-623 oK), 10 atm (1013 kPa), with a methanol-oxygen mixture fixed at 5.5% by volume methanol: air ratio. The iron(III) molybdate catalyst prepared by co-precipitation and filtration had a selectivity towards formaldehyde in methanol oxidation comparable with a commercial catalyst; maximum selectivity (82.3%) was obtained at 573oK when the conversion was 59.7%. Catalysts prepared by reacting iron (III) and molybdate by kneading or precipitation followed by evaporation, omitting a filtration stage, were less active and less selective. The selectivity-activity relationships of these catalysts as a function of temperature were discussed in relation to the method of preparation, surface areas and composition. By combing this catalytic data with data from the patent literature we demonstrate a synergy between iron and molybdenum in regard to methanol oxidation to formaldehyde; the optimum composition corresponded to an iron mole fraction 0.2-0.3. The selectivity to formaldehyde was practically constant up to an iron mole fraction 0.3 and then decreased at higher iron concentrations. The iron component can be regarded as the activity promoter. The iron molybdate catalysts can thus be related to other two-component MoO3-based selective oxidation catalysts, e.g. bismuth and cobalt molybdates. The iron oxide functions as a relatively basic oxide abstracting, in the rate-controlling step, a proton from the methyl of a bound methoxy group of chemisorbed methanol. It was proposed that a crucial feature of the sought after iron(III) molybdate catalyst is the presence of -O-Mo-O-Fe-O-Mo-O- groups as found in the compound Fe2(MoO4)3 and for Fe3+ well dispersed in MoO3 generally. At the higher iron(III) concentrations the loss of selectivity is due to the presence of iron oxide patches or particles which catalyze the total oxidation of methanol, and the loss of activity to blocking of molybdenum sites. 

scholarly journals Comparison of the Catalytic Performance of Ni/CeO2/ZrO2 and Commercial Catalyst during Steam Reforming of Methane

2008 ◽  
Vol 8 (1 & 2) ◽  
pp. 19
Author(s):  
Anton Purnomo ◽  
Susan Gellardo ◽  
Leonila Abella ◽  
Hirofumi Hinode ◽  
Chris Salim
Keyword(s):  
Steam Reforming ◽  
Thermo Gravimetric Analysis ◽  
Coke Formation ◽  
Catalytic Performance ◽  
Gravimetric Analysis ◽  
Commercial Catalyst ◽  
Operation Temperature ◽  
Zro2 Catalyst ◽  
Steam Reforming Of Methane

Catalytic performance and characterization of Ni/CeO2/ZrO2 and commercial catalyst from Indonesia were investigated in steam reforming of methane. Ni/CeO2/ZrO2 catalyst was prepared using co-impregnation of cerium nitrate and nickel nitrate onto zirconia support material. BET, SEM, EDS, XRD, TPD, TG, and ICP analyses were employed for the characterization of the catalysts. Remarkable catalytic performance of Ni/CeO2/ZrO2 catalyst at 600oC operating temperature and atmospheric pressure of about 74.9% methane conversion was obtained compared to 55.9% using the commercial catalyst. In addition, the presence of cerium in Ni/CeO2/ZrO2 was effective in improving the stability and resistance to coke formation. Less carbon formation was confirmed from the thermo-gravimetric analysis. These results showed that the prepared catalyst is promising in the industrial application which can be used at lower operation temperature for energy saving.

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